Revert "Merge remote-tracking branch 'upstream/master'"

This reverts commit 0d68e31, reversing
changes made to 14e2c79.

Author: jnecus

.travis.yml

@@ -75,7 +75,8 @@ matrix:
 
 before_install:
   - echo "before_install"
-  # Use blocking IO on travis.  Ref:  https://github.com/travis-ci/travis-ci/issues/8920#issuecomment-352661024
+  # set non-blocking IO on travis
+  # https://github.com/travis-ci/travis-ci/issues/8920#issuecomment-352661024
   - python -c 'import os,sys,fcntl; flags = fcntl.fcntl(sys.stdout, fcntl.F_GETFL); fcntl.fcntl(sys.stdout, fcntl.F_SETFL, flags&~os.O_NONBLOCK);'
   - source ci/travis_process_gbq_encryption.sh
   - export PATH="$HOME/miniconda3/bin:$PATH"

README.md

@@ -16,7 +16,6 @@
 [![Downloads](https://anaconda.org/conda-forge/pandas/badges/downloads.svg)](https://pandas.pydata.org)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/pydata/pandas)
 [![Powered by NumFOCUS](https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](https://numfocus.org)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 ## What is it?
 

doc/source/ecosystem.rst

@@ -30,7 +30,7 @@ substantial projects that you feel should be on this list, please let us know.
 Data cleaning and validation
 ----------------------------
 
-`Pyjanitor <https://github.com/ericmjl/pyjanitor/>`__
+`pyjanitor <https://github.com/ericmjl/pyjanitor/>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Pyjanitor provides a clean API for cleaning data, using method chaining.
@@ -115,7 +115,7 @@ It is very similar to the matplotlib plotting backend, but provides interactive
 web-based charts and maps.
 
 
-`Seaborn <https://seaborn.pydata.org>`__
+`seaborn <https://seaborn.pydata.org>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Seaborn is a Python visualization library based on
@@ -136,7 +136,7 @@ provides a powerful, declarative and extremely general way to generate bespoke p
 Various implementations to other languages are available.
 A good implementation for Python users is `has2k1/plotnine <https://github.com/has2k1/plotnine/>`__.
 
-`IPython vega <https://github.com/vega/ipyvega>`__
+`IPython Vega <https://github.com/vega/ipyvega>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 `IPython Vega <https://github.com/vega/ipyvega>`__ leverages `Vega
@@ -147,7 +147,7 @@ A good implementation for Python users is `has2k1/plotnine <https://github.com/h
 
 `Plotly’s <https://plot.ly/>`__ `Python API <https://plot.ly/python/>`__ enables interactive figures and web shareability. Maps, 2D, 3D, and live-streaming graphs are rendered with WebGL and `D3.js <https://d3js.org/>`__. The library supports plotting directly from a pandas DataFrame and cloud-based collaboration. Users of `matplotlib, ggplot for Python, and Seaborn <https://plot.ly/python/matplotlib-to-plotly-tutorial/>`__ can convert figures into interactive web-based plots. Plots can be drawn in `IPython Notebooks <https://plot.ly/ipython-notebooks/>`__ , edited with R or MATLAB, modified in a GUI, or embedded in apps and dashboards. Plotly is free for unlimited sharing, and has `cloud <https://plot.ly/product/plans/>`__, `offline <https://plot.ly/python/offline/>`__, or `on-premise <https://plot.ly/product/enterprise/>`__ accounts for private use.
 
-`Qtpandas <https://github.com/draperjames/qtpandas>`__
+`QtPandas <https://github.com/draperjames/qtpandas>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Spun off from the main pandas library, the `qtpandas <https://github.com/draperjames/qtpandas>`__
@@ -187,7 +187,7 @@ See :ref:`Options and Settings <options>` and
 :ref:`Available Options <options.available>`
 for pandas ``display.`` settings.
 
-`Quantopian/qgrid <https://github.com/quantopian/qgrid>`__
+`quantopian/qgrid <https://github.com/quantopian/qgrid>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 qgrid is "an interactive grid for sorting and filtering
@@ -249,12 +249,12 @@ The following data feeds are available:
  * Stooq Index Data
  * MOEX Data
 
-`Quandl/Python <https://github.com/quandl/Python>`__
+`quandl/Python <https://github.com/quandl/Python>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Quandl API for Python wraps the Quandl REST API to return
 Pandas DataFrames with timeseries indexes.
 
-`Pydatastream <https://github.com/vfilimonov/pydatastream>`__
+`pydatastream <https://github.com/vfilimonov/pydatastream>`__
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 PyDatastream is a Python interface to the
 `Refinitiv Datastream (DWS) <https://www.refinitiv.com/en/products/datastream-macroeconomic-analysis>`__
@@ -384,7 +384,7 @@ Pandas provides an interface for defining
 system. The following libraries implement that interface to provide types not
 found in NumPy or pandas, which work well with pandas' data containers.
 
-`Cyberpandas`_
+`cyberpandas`_
 ~~~~~~~~~~~~~~
 
 Cyberpandas provides an extension type for storing arrays of IP Addresses. These
@@ -411,4 +411,4 @@ Library         Accessor   Classes                   Description
 .. _pdvega: https://altair-viz.github.io/pdvega/
 .. _Altair: https://altair-viz.github.io/
 .. _pandas_path: https://github.com/drivendataorg/pandas-path/
-.. _pathlib.Path: https://docs.python.org/3/library/pathlib.html
+.. _pathlib.Path: https://docs.python.org/3/library/pathlib.html

doc/source/reference/offset_frequency.rst

@@ -1044,7 +1044,6 @@ Properties
     Tick.nanos
     Tick.normalize
     Tick.rule_code
-    Tick.n
 
 Methods
 ~~~~~~~
@@ -1078,7 +1077,6 @@ Properties
     Day.nanos
     Day.normalize
     Day.rule_code
-    Day.n
 
 Methods
 ~~~~~~~
@@ -1112,7 +1110,6 @@ Properties
     Hour.nanos
     Hour.normalize
     Hour.rule_code
-    Hour.n
 
 Methods
 ~~~~~~~
@@ -1146,7 +1143,6 @@ Properties
     Minute.nanos
     Minute.normalize
     Minute.rule_code
-    Minute.n
 
 Methods
 ~~~~~~~
@@ -1180,7 +1176,6 @@ Properties
     Second.nanos
     Second.normalize
     Second.rule_code
-    Second.n
 
 Methods
 ~~~~~~~
@@ -1214,7 +1209,6 @@ Properties
     Milli.nanos
     Milli.normalize
     Milli.rule_code
-    Milli.n
 
 Methods
 ~~~~~~~
@@ -1248,7 +1242,6 @@ Properties
     Micro.nanos
     Micro.normalize
     Micro.rule_code
-    Micro.n
 
 Methods
 ~~~~~~~
@@ -1282,7 +1275,6 @@ Properties
     Nano.nanos
     Nano.normalize
     Nano.rule_code
-    Nano.n
 
 Methods
 ~~~~~~~

doc/source/user_guide/computation.rst

@@ -648,24 +648,6 @@ from present information back to past information. This allows the rolling windo
 Currently, this feature is only implemented for time-based windows.
 For fixed windows, the closed parameter cannot be set and the rolling window will always have both endpoints closed.
 
-.. _stats.iter_rolling_window:
-
-Iteration over window:
-~~~~~~~~~~~~~~~~~~~~~~
-
-.. versionadded:: 1.1.0
-
-``Rolling`` and ``Expanding`` objects now support iteration. Be noted that ``min_periods`` is ignored in iteration.
-
-.. ipython::
-
-   In [1]: df = pd.DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
-
-   In [2]: for i in df.rolling(2):
-      ...:     print(i)
-      ...:
-
-
 .. _stats.moments.ts-versus-resampling:
 
 Time-aware rolling vs. resampling

doc/source/whatsnew/v1.1.0.rst

@@ -235,7 +235,6 @@ Other enhancements
   :class:`~pandas.io.stata.StataWriter`, :class:`~pandas.io.stata.StataWriter117`,
   and :class:`~pandas.io.stata.StataWriterUTF8` (:issue:`26599`).
 - :meth:`HDFStore.put` now accepts `track_times` parameter. Parameter is passed to ``create_table`` method of ``PyTables`` (:issue:`32682`).
-- Make :class:`pandas.core.window.Rolling` and :class:`pandas.core.window.Expanding` iterable（:issue:`11704`)
 
 .. ---------------------------------------------------------------------------
 
@@ -586,7 +585,6 @@ Deprecations
 
 - :func:`pandas.api.types.is_categorical` is deprecated and will be removed in a future version; use `:func:pandas.api.types.is_categorical_dtype` instead (:issue:`33385`)
 - :meth:`Index.get_value` is deprecated and will be removed in a future version (:issue:`19728`)
-- :meth:`DateOffset.__call__` is deprecated and will be removed in a future version, use ``offset + other`` instead (:issue:`34171`)
 
 .. ---------------------------------------------------------------------------
 
@@ -607,8 +605,6 @@ Performance improvements
   sparse values from ``scipy.sparse`` matrices using the
   :meth:`DataFrame.sparse.from_spmatrix` constructor (:issue:`32821`,
   :issue:`32825`,  :issue:`32826`, :issue:`32856`, :issue:`32858`).
-- Performance improvement for groupby methods :meth:`~pandas.core.groupby.groupby.Groupby.first`
-  and :meth:`~pandas.core.groupby.groupby.Groupby.last` (:issue:`34178`)
 - Performance improvement in :func:`factorize` for nullable (integer and boolean) dtypes (:issue:`33064`).
 - Performance improvement in reductions (sum, prod, min, max) for nullable (integer and boolean) dtypes (:issue:`30982`, :issue:`33261`, :issue:`33442`).
 
@@ -817,8 +813,6 @@ Groupby/resample/rolling
 - Bug in :meth:`GroupBy.first` and :meth:`GroupBy.last` where None is not preserved in object dtype (:issue:`32800`)
 - Bug in :meth:`Rolling.min` and :meth:`Rolling.max`: Growing memory usage after multiple calls when using a fixed window (:issue:`30726`)
 - Bug in :meth:`GroupBy.agg`, :meth:`GroupBy.transform`, and :meth:`GroupBy.resample` where subclasses are not preserved (:issue:`28330`)
-- Bug in :meth:`GroupBy.rolling.apply` ignores args and kwargs parameters (:issue:`33433`)
-
 
 Reshaping
 ^^^^^^^^^

pandas/_libs/groupby.pyx

@@ -9,9 +9,11 @@ cimport numpy as cnp
 from numpy cimport (ndarray,
                     int8_t, int16_t, int32_t, int64_t, uint8_t, uint16_t,
                     uint32_t, uint64_t, float32_t, float64_t, complex64_t, complex128_t)
-from numpy.math cimport NAN
 cnp.import_array()
 
+cdef extern from "numpy/npy_math.h":
+    float64_t NAN "NPY_NAN"
+
 from pandas._libs.util cimport numeric, get_nat
 
 from pandas._libs.algos cimport (swap, TiebreakEnumType, TIEBREAK_AVERAGE,

pandas/_libs/hashtable.pyx

@@ -8,9 +8,10 @@ from libc.stdlib cimport malloc, free
 import numpy as np
 cimport numpy as cnp
 from numpy cimport ndarray, uint8_t, uint32_t, float64_t
-from numpy.math cimport NAN
 cnp.import_array()
 
+cdef extern from "numpy/npy_math.h":
+    float64_t NAN "NPY_NAN"
 
 from pandas._libs.khash cimport (
     khiter_t,
@@ -53,7 +54,7 @@ from pandas._libs.khash cimport (
 )
 
 
-from pandas._libs cimport util
+cimport pandas._libs.util as util
 
 from pandas._libs.missing cimport checknull
 

pandas/_libs/index.pyx

@@ -19,10 +19,11 @@ from numpy cimport (
 cnp.import_array()
 
 
-from pandas._libs cimport util
+cimport pandas._libs.util as util
 
+from pandas._libs.tslibs import Period, Timedelta
 from pandas._libs.tslibs.nattype cimport c_NaT as NaT
-from pandas._libs.tslibs.base cimport ABCTimestamp, ABCTimedelta, ABCPeriod
+from pandas._libs.tslibs.base cimport ABCTimestamp
 
 from pandas._libs.hashtable cimport HashTable
 
@@ -469,7 +470,7 @@ cdef class TimedeltaEngine(DatetimeEngine):
         return 'm8[ns]'
 
     cdef int64_t _unbox_scalar(self, scalar) except? -1:
-        if not (isinstance(scalar, ABCTimedelta) or scalar is NaT):
+        if not (isinstance(scalar, Timedelta) or scalar is NaT):
             raise TypeError(scalar)
         return scalar.value
 
@@ -479,7 +480,7 @@ cdef class PeriodEngine(Int64Engine):
     cdef int64_t _unbox_scalar(self, scalar) except? -1:
         if scalar is NaT:
             return scalar.value
-        if isinstance(scalar, ABCPeriod):
+        if isinstance(scalar, Period):
             # NB: we assume that we have the correct freq here.
             return scalar.ordinal
         raise TypeError(scalar)

pandas/_libs/internals.pyx

@@ -1,6 +1,5 @@
-from collections import defaultdict
-
 import cython
+from collections import defaultdict
 from cython import Py_ssize_t
 
 from cpython.slice cimport PySlice_GetIndicesEx